'''编写程序计算一致字符串中小写字母的数量'''
str = input('请输入需要计算小写字母数量的内容:')
word_list = ['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z',]
counter = 0
for i in str:
    if i in word_list:
        counter += 1
print(f'小写英文字母数量为:{counter}')